18ct rose gold Zenith Grandes Chronomaster XT Flyback 18.1250.4009 Automatic El Primero 405B Movement. Case diameter 43 mm. Water resistant 100 meters. Column Wheel Chronograph With Flyback Function. 36,000vph, 31 jewels, 331 parts, power reserve of 50 hours. Silver dial with luminous index hour markers and silver sub dials. 30 minute sub-dial at 3 o’clock, 12 hour sub-dial at 6 o’clock position, small running seconds sub-dial at 9 o’clock position. Date window located between 4 and 5 position. Sapphire crystal see through case back. Croc strap with rose gold folding clasp. Box and papers dated January 2004. Our reference S19350.